Let's start with a link page to Europe's budget airlines. This is a growing list, and it's tough to keep current because many of these bold challengers fail to survive in a brutal competitive business environment. Nonetheless, take a look at Euroflights.infofor a list of budget airlines and the cities they serve within Europe.

Next, a list of larger carriers competing with the budget airlines:

Aer Lingus offers sale fares from the home page and their base in Ireland.

Air Berlin might not quite qualify as a "budget airline," but it offers some excellent deals between North America and Europe, as well as between European cities.

Air France presents its top sales on the homepage.

Alitalia from Italy usually organizes its sale fares by season.

British Airways is pushed to compete with the United Kingdom's many budget carriers. They offer a variety of special offers.

CSA is based in the Czech Republic.

Iberia is based in Spain but serves Europe and 23 American airports.

Icelandair has long been a budget favorite of people traveling between Europe and North America. They post their sale offers on the home page.

KLM is a Dutch airline that partners with Delta Airlines. The page linked here shows KLM deals, priced in euros.

Lufthansa presents "Top Offers" to and from its base in Germany.

Luxembourg Airlines is well-known by budget travelers, and offers a variety of deals that get you to and from their location in the center of Western Europe.

Swiss International Airlines presents "destinations of the month" with sale fares to match.

Virgin Atlantic is based in the U.K. and usually links its best deals from the homepage.